<template>
  <div id="app">
    <div>
      <span>姓名:</span>
      <input type="text" v-model.trim="form.uname" />
    </div>
    <div>
      <span>年龄:</span>
      <input type="number" v-model.number="form.age" />
    </div>
    <div>
      <span>性别:</span>
      <select v-model="form.gender">
        <option value="男">男</option>
        <option value="女">女</option>
      </select>
    </div>
    <div>
      <button @click="changeList">添加/修改</button>
    </div>
    <div>
      <table border="1" cellpadding="10" cellspacing="0">
        <tr>
          <th>序号</th>
          <th>姓名</th>
          <th>年龄</th>
          <th>性别</th>
          <th>操作</th>
        </tr>
        <tr v-for="(item, index) in list" :key="item.id">
          <td>{{ index + 1 }}</td>
          <td>{{ item.uname }}</td>
          <td>{{ item.age }}</td>
          <td>{{ item.gender }}</td>
          <td>
            <button @click="del(item.id)">删除</button>
            <button @click="edit(item.id)">编辑</button>
          </td>
        </tr>
      </table>
    </div>
  </div>
</template>
<script>
export default {
  data() {
    return {
      list: JSON.parse(localStorage.getItem('students-list')) || [],
      form: {
        id: '',
        uname: '',
        age: '',
        gender: '',
      },
    }
  },
  methods: {
    changeList() {
      if (
        !this.form.uname ||
        this.form.age === '' ||
        this.form.age < 0 ||
        this.form.gender === ''
      ) {
        return alert('请正确输入信息')
      }
      if (!this.form.id) {
        this.list.push({
          id: this.list.length ? this.list.at(-1).id + 1 : 1,
          uname: this.form.uname,
          age: this.form.age,
          gender: this.form.gender,
        })
      } else {
        this.list.filter((item, index) => {
          if (item.id === this.form.id) {
            item = { ...this.form }
          }
          this.list.splice(index, 1, item)
        })
      }
      this.form.id = ''
      this.form.uname = ''
      ;(this.form.age = 0), (this.form.gender = '')
    },
    del(id) {
      this.list = this.list.filter((item) => item.id !== id)
    },
    edit(id) {
      this.list.filter((item) => {
        if (item.id === id) this.form = { ...item }
      })
    },
  },
  watch: {
    list() {
      localStorage.setItem('students-list', JSON.stringify(this.list))
    },
  },
}
</script>
